"""
DevWalker.py is for avatars.

A walker control such as this one provides:

- creation of the collision nodes
- handling the keyboard and mouse input for avatar movement
- moving the avatar

it does not:

- play sounds
- play animations

although it does send messages that allow a listener to play sounds or
animations based on walker events.
"""

from direct.showbase.InputStateGlobal import inputState
from direct.directnotify import DirectNotifyGlobal
from direct.showbase import DirectObject
from direct.showbase.MessengerGlobal import messenger
from direct.task.Task import Task
from direct.task.TaskManagerGlobal import taskMgr
from panda3d.core import ClockObject, ConfigVariableBool, ConfigVariableDouble, Mat3, Point3, Vec3


class DevWalker(DirectObject.DirectObject):

    notify = DirectNotifyGlobal.directNotify.newCategory("DevWalker")
    wantDebugIndicator = ConfigVariableBool('want-avatar-physics-indicator', False)
    runMultiplier = ConfigVariableDouble('dev-run-multiplier', 4.0)

    # Ghost mode overrides this:
    slideName = "slide-is-disabled"

    # special methods
    def __init__(self):
        DirectObject.DirectObject.__init__(self)
        self.speed=0.0
        self.rotationSpeed=0.0
        self.slideSpeed=0.0
        self.vel=Vec3(0.0, 0.0, 0.0)

        self.task = None

    def setWalkSpeed(self, forward, jump, reverse, rotate):
        assert self.debugPrint("setWalkSpeed()")
        self.avatarControlForwardSpeed=forward
        #self.avatarControlJumpForce=jump
        self.avatarControlReverseSpeed=reverse
        self.avatarControlRotateSpeed=rotate

    def getSpeeds(self):
        #assert self.debugPrint("getSpeeds()")
        return (self.speed, self.rotationSpeed, self.slideSpeed)

    def setAvatar(self, avatar):
        self.avatar = avatar
        if avatar is not None:
            pass # setup the avatar

    def setWallBitMask(self, bitMask):
        pass

    def setFloorBitMask(self, bitMask):
        pass

    def initializeCollisions(self, collisionTraverser, avatarNodePath,
            wallCollideMask, floorCollideMask,
            avatarRadius = 1.4, floorOffset = 1.0, reach = 1.0):
        assert not avatarNodePath.isEmpty()

        self.cTrav = collisionTraverser
        self.avatarNodePath = avatarNodePath

    def setAirborneHeightFunc(self, getAirborneHeight):
        pass

    def deleteCollisions(self):
        pass

    def setTag(self, key, value):
        pass

    def setCollisionsActive(self, active = 1):
        pass

    def placeOnFloor(self):
        pass

    def oneTimeCollide(self):
        pass

    def addBlastForce(self, vector):
        pass

    def displayDebugInfo(self):
        """
        For debug use.
        """
        onScreenDebug.add("w controls", "DevWalker")

    def handleAvatarControls(self, task):
        """
        Check on the arrow keys and update the avatar.
        """
        # get the button states:
        forward = inputState.isSet("forward")
        reverse = inputState.isSet("reverse")
        turnLeft = inputState.isSet("turnLeft")
        turnRight = inputState.isSet("turnRight")
        slideLeft = inputState.isSet("slideLeft")
        slideRight = inputState.isSet("slideRight")
        levitateUp = inputState.isSet("levitateUp")
        levitateDown = inputState.isSet("levitateDown")
        run = inputState.isSet("run") and self.runMultiplier.getValue() or 1.0

        # Check for Auto-Run
        if base.localAvatar.getAutoRun():
            forward = 1
            reverse = 0

        # Determine what the speeds are based on the buttons:
        self.speed=(
                (forward and self.avatarControlForwardSpeed or
                reverse and -self.avatarControlReverseSpeed))
        self.liftSpeed=(
                (levitateUp and self.avatarControlForwardSpeed or
                levitateDown and -self.avatarControlReverseSpeed))
        self.slideSpeed=(
                (slideLeft and -self.avatarControlForwardSpeed) or
                (slideRight and self.avatarControlForwardSpeed))
        self.rotationSpeed=(
                (turnLeft and self.avatarControlRotateSpeed) or
                (turnRight and -self.avatarControlRotateSpeed))

        if self.wantDebugIndicator:
            self.displayDebugInfo()

        # Check to see if we're moving at all:
        if self.speed or self.liftSpeed or self.slideSpeed or self.rotationSpeed:
            # How far did we move based on the amount of time elapsed?
            dt=ClockObject.getGlobalClock().getDt()
            distance = dt * self.speed * run
            lift = dt * self.liftSpeed * run
            slideDistance = dt * self.slideSpeed * run
            rotation = dt * self.rotationSpeed

            # Take a step in the direction of our previous heading.
            self.vel=Vec3(Vec3.forward() * distance +
                          Vec3.up() * lift +
                          Vec3.right() * slideDistance)
            if self.vel != Vec3.zero():
                # rotMat is the rotation matrix corresponding to
                # our previous heading.
                rotMat=Mat3.rotateMatNormaxis(self.avatarNodePath.getH(), Vec3.up())
                step=rotMat.xform(self.vel)
                self.avatarNodePath.setFluidPos(Point3(self.avatarNodePath.getPos()+step))
            self.avatarNodePath.setH(self.avatarNodePath.getH()+rotation)
            messenger.send("avatarMoving")
        else:
            self.vel.set(0.0, 0.0, 0.0)
        return Task.cont

    def enableAvatarControls(self):
        """
        Activate the arrow keys, etc.
        """
        assert self.debugPrint("enableAvatarControls")

        if self.task:
            # remove any old
            self.task.remove(self.task)
        # spawn the new task
        self.task = taskMgr.add(
            self.handleAvatarControls, "AvatarControls-dev-%s"%(id(self),))

    def disableAvatarControls(self):
        """
        Ignore the arrow keys, etc.
        """
        assert self.debugPrint("disableAvatarControls")
        if self.task:
            self.task.remove()
            self.task = None

    def flushEventHandlers(self):
        pass

    if __debug__:
        def debugPrint(self, message):
            """for debugging"""
            return self.notify.debug(
                    str(id(self))+' '+message)